Tube-number record
TBL12/25
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TBL12/25 is a tube type in the TubeDatabase archive (class: RF Power Triode). Recorded specifications: construction Triode, maximum plate voltage 12000 V, and maximum plate dissipation 15000 W. The archive does not yet hold a photographed example of this type.
ClassRF Power Triode
Construction
Primary TypeTriode
EnvelopeGlass/Metal
SectionsSingle
Filament / Heater
MaterialThoriated tungsten
Absolute Maximum Ratings
Plate Voltage12000 V
Plate Dissipation15000 W
Audio Performance
Key Features
- Air cooled
- Directly heated
- Thoriated tungsten filament
- Industrial RF use
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| RF Class C Oscillator | 12000 V | 20000 | 1700 | 34 | 3200 mA |
| RF Class C Oscillator | 10000 V | — | — | — | 3200 mA |
| RF Class C Oscillator | 8000 V | — | — | — | 3200 mA |
Application Notes
To ensure a uniform RF current distribution in the grid seal especially at frequencies higher than 4 MHz, the grid lead should be connected specifically as indicated in technical drawings.
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